How To Choose High-Quality Homemade Concrete Accelerator?
When you get off work, you leave the computer chair, turn off the linear lights, and prepare to ride home on a 75km electric moped with disposable vinyl gloves. After cooking in a kitchen inlaid with granito ceramic tiles and loading food with aluminum foil serving trays, and then finish your dinner, you may plan to exercise with an elliptical machine. Even if it's raining and thundering outside, don't be afraid, because the building is strong enough. Cement plays an indispensable and important role.
Today, the world's cement consumption has reached the level of 4 billion tons per year. The electricity consumed in the cement production process is approximately 110 kW/ton, of which about 30% of the power is used in the raw material preparation stage, and 40% is used to grind cement clinker. This power consumption rate leads to a significant increase in costs, especially in areas where power is scarce. In addition to the obligation to process more and more ores containing finely dispersed minerals, our limited energy resources and rising energy costs pose challenges for process engineers. One research route that has been explored for about half a century is to develop mill feed additives to significantly improve milling efficiency. Such additives are called grinding aids.
What is the cement grinding aid made of?
The most common components of grinding aids are ethanolamine, such as triethanolamine (TEA) and triisopropanolamine (TIPA), and glycols, such as diethylene glycol (DEG) and propylene glycol (PG). The grinding aid cannot retain its original molecular structure after the grinding process. In addition, the grinding aid will be adsorbed on the cement particles in some way, thereby changing the performance of the freshly mixed and hardened concrete. Generally, the concentration range of the grinding aid used is very important to the performance of the cement. For example, in Portland cement, 0.02% TEA is added as a set accelerator, 0.25% TEA is added as a retarder, 0.5% TEA is added as a retarder, and 1% TEA is added as a retarder as a powerful accelerator.
How to choose cement grinding aids?
The needs of cement companies determine what kind of grinding aids to use. Verification of grinding aids is a time-consuming and laborious process. Generally, two steps are used to verify grinding aid products; the first is to conduct laboratory selection experiments; The second is to carry out industrial large-scale grinding test; laboratory selection experiments can use modular dropwise comparative experiments to verify the promotion of grinding aids on cement hydration, and to react to the strength, setting time and fluidity of the grinding aids on cement. The influence of other factors is mainly chemical performance. The industrial grinding test mainly verifies the influence of the grinding aid on the mill system, and also verifies the change of cement quality. By analyzing and evaluating the results through experiments, find the difference compared with the target, and modify the plan according to the difference, and modify the strength, the amount of mixed materials, the amount of grinding aids, and the specific surface area. When the grinding aid is used normally, the quality of the grinding aid should also be verified frequently. On the other hand, it is to verify whether the cement fluctuates and whether it is necessary to deploy a grinding aid formula.
Safety and convenience
While ensuring that the grinding aid is effective, it must also be ensured that the grinding aid is safe, whether it is for the human body, cement or concrete. Some illegal grinding aid suppliers are pursuing the strength of cement one-sidedly, adding a large amount of substances harmful to the human body, cement or concrete, such as urea, certain toxic substances, inorganic salts or some concrete admixtures, etc. Although there is no clear standard stipulation in some areas, it is recommended not to adopt it in terms of safety management. Certain powdery grinding aids are not recommended for their crude production process, unstable products, and a large number of stimulating salts. At the same time, some of the formulations of grinding aids are inherently flawed, or the formulations are modified artificially during the production of grinding aids, cutting corners, making the product unstable, or appearing precipitation, or prone to blockage, material breakage, which is not conducive to accurate and stable addition. All this will affect the quality of cement and mill output.
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